Econoline E350 1 Ton V8-5.4L Prop SOHC VIN Z (1998)
Valve: Customer Interest
Engine - Rough Idle/Noise When Cold
Article No.
00-26-1
12/25/00
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ENGINE - ROUGH IDLE/MISS AFTER START-UP
DURING COLD AMBIENT TEMPERATURES LESS
THAN - 12 DEGREES C (10 DEGREES F) -
VEHICLES BUILT 3/1/1996 THROUGH 7/31/2000
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NOISE - FROM ENGINE - ROUGH IDLE/MISS AFTER
START-UP DURING COLD AMBIENT
TEMPERATURES LESS THAN - 12 DEGREES C (10
DEGREES F) - VEHICLES BUILT 3/1/1996 THROUGH
7/31/2000
FORD:
1997-1999 F-250 LD
1997-2000 ECONOLINE, EXCURSION, EXPEDITION, F-150
1999-2000 F SUPER DUTY
LINCOLN:
1998-1999 NAVIGATOR
ISSUE
Some vehicles equipped with a 4.6L, 5.4L, or 6.8L engine may exhibit a rough idle/miss after start-up in cold ambient temperatures (less than -12°C/10 °
F). This may be caused by a roller finger follower(s) being dislodged from the valve. This may result in damage to the camshaft, roller finger follower,
valve, retainer, etc. A procedure is now available to service this condition.
ACTION
Inspect and replace any worn or damaged engine valve components and install new retaining clip and lash adjuster for service. Refer to the following
Service Procedure for details.
SERVICE PROCEDURE
Perform normal engine diagnostic routines before opening valve covers. If the valve train is suspect, remove the valve covers and look for Roller Finger
Follower(s) (RFF) that may have become dislodged.
1.
Inspect the following parts that may have been damaged by any dislodged roller finger followers:
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Cam lobes (chipped or grooved)
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Valve stem tips (mushroomed, metal displaced, or bent)
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Roller finger followers (chipped or grooved)
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Inspect valve guide only if its corresponding RFF or valve stem tip is damaged.
Replace damaged parts as necessary.
2.
If follower(s) are damaged, replaced as necessary, otherwise re-use followers in same location as removed from head.
3.
Remove all intake and exhaust lash adjusters from the engine and replace with service-only Lash Adjusters (YL3Z-6500-AA). Refer to the
appropriate workshop Manual, Section 303-01B for service procedures and tooling necessary to compress the valve springs and remove the roller
followers.
